o common and so destructive of health and life that
they must be classed among the most dangerous diseases that now
threaten the human race. This ought to be sufficient to attract the
serious attention of every thinking man and woman.

[Sidenote: Double standard of morality.]

Thus, in general survey, we see the great problems of social-sexual
hygiene caused by diseases that are widely distributed because sexual
instincts are uncontrolled. In short, the alarming problem of the
social diseases results from masculine promiscuity or the failure of
men to adhere to the monogamic standards of morality. In other and
familiar phrasing, there is widespread acceptance and practice of the
so-called "double standard of sexual morality," a monogamic one for
respectable women and promiscuity for many of their male relatives and
friends. (See writings of Morrow, especially "The Sex Problem"; also
Creighton's "The Social Disease.")

[Sidenote: One problem for sex-education.]

Our brief survey of the hygienic problems caused by sexual promiscuity
and its characteristic diseases is sufficient to indicate one great
problem for sex-education. Such social-hygiene problems have been most
responsible for the recent and rapid rise of the movement for
sex-education, and they must be recognized in any adequate scheme for
instruction of young people.

[Sidenote: Is sex-hygiene adequate?]

Can scientific education hope to solve the sexual problems of society
by inculcating such fear of venereal diseases that men will remain true
to the monogamic code of morality? Many cynical disbelievers in
sex-hygiene answer this question negatively by asking in biblical
phrase, "Can the leopard change his spots?" In other words, these
doubting ones believe that sexual instincts are so firmly fixed in the
nature of _many_ men and _some_ women that there is no hope of radical
change through education.[3] There is something in this point of view.
It is probably true that even the most radical advocates of
sex-education do not hope to secure universal monogamy and consequent
disappearance of social diseases. A conservative and rational answer to
the above question whether sex-education can solve the problem of
social diseases, is that a large percentage of even civilized people
are not yet ready to have their most powerful instincts controlled by
scientific knowledge. Hence, there is no hope that the hygienic task of
sex-education will be finished soon afte